Photovoltaic

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Paul Gilman
PV Modules and Inverters not in Database

If you are using SAM's detailed photovoltaic model for a photovoltaic system that uses a module or inverter that is not included in SAM's libraries, you can use the CEC Performance Model with User Entered Specifications or Inverter Datasheet options on the Module and Inverter input pages, respectively. Those options allow you to enter data from a manufacturer's data sheet. Behind the scenes, SAM generates the coefficients it needs to model the equipment.

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a_zuiker
Positive 'Module' Losses

I can't figure out why my 'module' losses are positive (+0.606%). Why is this the case? I'm using technical parameters from the CEC database.

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Sihanuk
Sihanuk's picture
Datos para la republica dominicana

Donde y como puedo agregar los datos de la Republica Dominicana al software?

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danjhealy1@gmail.com
Location and Interval Load Data Errors

Hi Guys,

I've gone through your webinars and followed your steps pretty closely. I'm getting a bunch of errors when I go to run a simple PVWatts, commercial simulation. I believe the errors are caused by two of my own inputs, as when I use the inbuilt inputs I do not get the same errors.

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westinvg
daily energy collected

Comparative study cpv systems with tracking two axis and one axis systems (east-west and north south)
where i can found the daily energy collected for each tracking systems??

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nad9233
PV standards and certifications

What are the most important standards and certifications that needed to be in PV modules ?

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dcorning
Inverters in database with same max DC voltage as max MPPT DC voltage?

Hey, when modeling a specific system configuration, we came across a very low kWh/kW yield. Everything appeared to be in order, in that the correct models for module and inverter (in this case the Northern Electric: BDM-300X2) were selected, and system design was all in order.

For this inverter the max MPPT voltage is 48V but the maximum input voltage is 60V. It appears in the database to be set to 48V for both max DC input voltage and max MPPT DC voltage, which we believe is causing an error in modeling the kWh produced by the system.

1 post / 0 new
dcorning
Inverters in database with same max DC voltage as max MPPT DC voltage?

Hey, when modeling a specific system configuration, we came across a very low kWh/kW yield. Everything appeared to be in order, in that the correct models for module and inverter (in this case the Northern Electric: BDM-300X2) were selected, and system design was all in order.

For this inverter the max MPPT voltage is 48V but the maximum input voltage is 60V. It appears in the database to be set to 48V for both max DC input voltage and max MPPT DC voltage, which we believe is causing an error in modeling the kWh produced by the system.

2 posts / 0 new
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bpm77
3D shading calculator

Hello Paul,

I'm trying to use the 3D shading calculator for the file attached. However, once I click to save the model the warning in the box appears (for all subarrays).

I do understand that, for example, my first active surface is subarray 1 - string 1 and I have in total 123 strings for this subarray. My question is: how do I include all my strings? It seems that each subarray only supports 8 strings, therefore it looks to me that I cannot do it. Am I missing something? Is there a way around this?

Thanks for the support,

Bruno

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bpm77
Can I modify a cell temperature model equation

Hello Paul,

I'm trying to use SAM to model a floating PV system and I wanted to change the equation SAM uses to calculate cell temperature. The equation found in the literature is rather simple and considers ambient temperature, irradiance and wind speed something between the lines of tcell = a*ambient temperature + b*irradiance + c*wind speed.

Is there a way to modify the way it is calculated to a user input equation?

Thanks for the support,

Bruno

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